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K’nex building systems are dynamic and open-ended, and let kids learn about science and engineering while building cool, motorized gadgets. This set of four Robo BattlersAce, Flash, Slasher, and Stompereach come with about 120 parts and motors that enable unique movements. Kits can be combined to create bigger robots.

WARNING: CHOKING HAZARDsmall parts not for children under 3 years.

For ages 7 and up. Two AA batteries per kit, not included. Approximately 9"W x 9"H.